<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>js13.1cookie 操作</title>
	</head>
	<body>
		<script type="text/javascript">
			// 读取指定名称的cookie，若不存在则返回空字符串
			function getCookie(c_name)
			{
				if (document.cookie.length > 0){
					c_start = document.cookie.indexOf(c_name + "=")
				    if (c_start != -1){ 
					    c_start = c_start + c_name.length + 1; 
					    c_end = document.cookie.indexOf(";", c_start)
					    if (c_end == -1){
					    	c_end=document.cookie.length
					    }
					    return unescape(document.cookie.substring(c_start, c_end))
				    } 
				}
				return "";
			}
			
			var result = getCookie("username");
			console.log(result);
		</script>
	</body>
</html>
